Tracks view-state changes to the System.Web.UI.WebControls.TreeView control so that they can be stored in the System.Web.UI.StateBag object for the control. This System.Web.UI.StateBag is accessible through the System.Web.UI.Control.ViewState property.
The TreeView.TrackViewState method is overridden to mark the starting point to begin tracking and saving changes to the control as part of the view state for the control.